Pseudoephedrine is a key component in making methamphetamine and customers are limited by state law to buying 9-grams per month without a prescription. It's found in many over-the-counter cold medications.

OBN spokesman Mark Woodward says police and agents began serving the warrants Monday throughout Payne County. He says 34 people had been arrested by 11 a.m. Tuesday on misdemeanor counts of buying more pseudoephedrine than allowed by law.